A fun find. I used to roll hunt and got a number of these in a year and a half. The dull thud they make when dropped also is a dead giveaway.
If you want to see if the inside was coated with a Mexican coin or a Brit penny, then put the coin into the bottom of a thick glass and shake the glass, while holding the rim, to separate the two parts. Otherwise you need what is a called a "bang ring" to separate it. I have seen these in aluminum on
ebay and also as 3-D printer files that can be downloaded/printed.

How much squash could a Sasquatch squash if a Sasquatch would squash squash?
Download and read: Grading the graders
Costly
TPG ineptitude and No FG
Kennedy halveshttps://ln5.sync.com/dl/7ca91bdd0/w...i3b-rbj9fir2